Well, if you can't beat 'em, join 'em.
I've always meant to get through the Foundation series. I think the first time I tried I was a little too young, or just didn't get hooked so I gave up early. I had a pretty good chunk of those around in junior high school and thereabouts. Every once in a while I get back to something I gave up on earlier and it usually turns out to be a good thing.
But books I actually have read... I tend to read semi-schlocky stuff. (Not as bad as my wife, who continues to choke down romance novels, though.) Lately my trend has been to find a particular author and read every book written by them I can find in the library.
I just read the couple of newer books Card tacked on to the Ender's Game series, then ended up with a couple of his Homecoming series which I'm working on know. (About halfway through 4 of 5) Not fantastic, but pretty good. His Alvin Maker series is great, too.
Other favorite sci fi is Asimov, Heinlen, and (forgive me) Hubbard. Has anyone else here ever managed to get through the entire Mission Earth series? Granted, the man was seriously deranged, but it makes for some entertaining reading. Battlefield Earth was also a pretty good read, though it made an awful movie.
David Eddings is pretty good. The series starting with the Belgariad and ending with god knows what (he keeps managing to tack more books onto it.)
Robert Jordan's Wheel of Time series is probably one of the best put together series I've read, but it's not done and it's so complicated that every time a new book comes out, I have to reread all the old ones to remember what the hell is going on. He tends to keep a couple dozen of important main characters all running around in different parts of the world doing different things all at the same time. It makes my head hurt.
On a completely different tack is Donald Westlake who writes comedy crime novels. If you've never read him and are looking for an entertaining read, check him out. Anything with his Dortmunder character is bound to be pretty good. Try the Hot Rock for starters.
He also writes under the pseduonym Richard Stark. Also crime, but a little more serious. People never get hurt in the Dortmunder books. It's like the GI Joe comics where everyone has a parachute when their plane blows up. When he writes as Stark he has no qualms about snuffing people. (He wrote Payback, which was turned into the film with Mel Gibson.)
Have I bored anyone to death yet? I wouldn't go so far as to say any of this is extraordinarily great literature, except for maybe Ender's Game, which I would call a must read.
And to show I'm not a complete loser, another of my top five favorites is probably Surely You're Joking Mr. Feynman, the autobiography of Richard Feynman.
I'm starting to rant. Like everyone else I'm sure, I could just keep spewing out books till I keel over. I'll shut up now.
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100 pounds of shit in a 25 pound sack.